840051AGI

REV. A 5/20/16

2

ICS840051I

FEMTOCLOCKS™ CRYSTAL-TO-

LVCMOS/LVTTL CLOCK GENERATOR

PRODUCT DISCONTINUATION NOTICE - LAST TIME BUY EXPIRES MAY 6, 2017

TABLE 2. PIN CHARACTERISTICS

TABLE 1. PIN DESCRIPTIONS

Symbol

Parameter

Test Conditions

Minimum

Typical

Maximum

Units

C

IN

Input Capacitance

4

pF

C

PD

Power Dissipation Capacitance

V

DD, VDDA = 3.465V

7

pF

V

DD, VDDA = 2.625V

7

pF

R

PULLUP

Input Pullup Resistor

51

K

Ω

R

PULLDOWN

Input Pulldown Resistor

51

K

Ω

R

OUT

Output Impedance

15

Ω

Number

Name

Type

Description

1V

DDA

Power

Analog supply pin.

2

OE

Input

Pullup

Output enable pin. When HIGH, Q0 output is enabled. When LOW, forces

Q0 to HiZ state. LVCMOS/LVTTL interface levels. See Table 3A.

3, 4

XTAL_OUT,

XTAL_IN

Input

Crystal oscillator interface. XTAL_IN is the input,

XTAL_OUT is the output.

5

FREQ_SEL

Input

Pulldown Frequency select pin. LVCMOS/LVTTL interface levels. See Table 3B.

6

GND

Power

Power supply ground.

7

Q0

Output

Single-ended clock output. LVCMOS/LVTTL interface levels.

15

Ω output impedance.

8V

DD

Power

Core supply pin.

NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.

TABLE 3A. CONTROL FUNCTION TABLE

Control Input

Output

OE

Q0

0

Hi-Z

1

Active

TABLE 3B. FREQ_SEL FUNCTION TABLE

Control Input

N Divider

FRE_SEL

0

÷4 (default)

1÷8